Helicopters flying near Reagan National Airport caused flight diversions yesterday (Sunday) and Thursday. The first incident involved an Army Black Hawk helicopter taking a "scenic route around the Pentagon,

The National Transportation Safety Board is now investigating the aborted landings of two commercial flights approaching Reagan National Airport on Thursday as a U.S. Army Black Hawk helicopter was approaching the Pentagon nearby.

The episode followed a fatal collision between a military helicopter and a commercial jet in January, and prompted concern and outrage among officials.